Answer:
13. ABCD and DCBA
14. BA and CD
15. AB abd BC
16. The points B and L can be collinear.
Explanation:
See the given diagram of a straight line that extends from -∞ to +∞.
13. ABCD and DCBA are the two different names of the line.
14. BA and CD are the names of different opposite rays.
15. AB and BC are the two line segments.
16. The line between points B and L can be drawn separately. So, the points B and L can be collinear. (Answer)